Update index.html (#1798)

cli/browser-demo/index.html

@@ -16,7 +16,7 @@ async function start() {
 	await init('./pkg/polkadot_cli_bg.wasm');
 	log('Successfully loaded WASM');
 	log('Fetching chain spec');
-	const chain_spec_response = await fetch("https://raw.githubusercontent.com/paritytech/polkadot/master/service/res/westend.json");
+	const chain_spec_response = await fetch("https://raw.githubusercontent.com/paritytech/polkadot/master/node/service/res/westend.json");
 	const chain_spec_text = await chain_spec_response.text();
 
 	// Build our client.